<template>
   <footer class="footer">
      <!-- This should be `0 items left` by default -->
      <span class="todo-count">剩余<strong>{{shengyu}}</strong></span>
      <!-- Remove this if you don't implement routing -->
      <ul class="filters">
        <li>
           <a :class="{selected: flag === '1'}" @click="$emit('changeFlag',1)" href="#/">全部任务</a>
        </li>
        <li>
         <a :class="{selected: flag === '2'}"  @click="$emit('changeFlag',2)" href="#/active">进行中</a>
        </li>
        <li>
           <a :class="{selected: flag === '3'}" @click="$emit('changeFlag',3)" href="#/completed">已完成</a>
        </li>
      </ul>
      <!-- Hidden if no completed items are left ↓ -->
      <button class="clear-completed" @click="$emit('delCompleted')">清除已完成</button>
    </footer>
</template>

<script>
export default {
  props:{
    list:Array,
     flag: Number
  },
  computed:{
    shengyu(){
      return this.list.filter(item=> item.isDone===false).length
    }
  }
}
</script>

<style>

</style>